PS Magazine - TB 43-PS-442
PS, The Preventative Maintenance Monthly
ISSUE 442
SEPTEMBER 1989
c
fCTIOt oBJFC±01 C²jc³i´µ
S
ome Black Hawk mechanics don't
believe you have to disconnect the ends
of the main rotor head pItch control
roDs to inspect the bearIngs Fr wear.
They say you can get a good readIng
by just liftIng the rod to relieve t±e
pressure²
They're also mistaken.
³´ you don't disconnect the rod, you
can't put the µeler gage straight In to
get an accurate reading.
Plus, you
won't get a good view of the whole
bearing surface.
40
THE ONLY
WAy t6e±
an ²CcUR³´µ
r¶·DI¸&
iS ¹d
º» s¼o½¾¿ÀÁ
ÂhÃ
ROD!'
What you can see may look good¶
but what you can't see may be corroded
or pitted beyond lImits²
³´ you ´ind coRrosion, remove it with
a nylon scourIng pad, NSN 7920-00·
934¸3469. Never use solvent to clean
the bearings²
³f you see 5 or more pits in a
l2
Inch
diameter circle, or if any pit is Deeper
than 0.050 inch, replace the a¹ected
rod end like it says in Step 3 of Task
11, TM 55·1520¸23º·2»¼7. Use dial
indicator, NSN 5210·00·277½8840, to
measure pItting depth.
To check the ¾earings Fr wear, use
a locally made plastic µeler gage. ¿ig
6·1. 1 of the TM shows how to make
the µeler gage. You no longer use the
dial indicator method to check ¾earing
wear.
ÄÅP 89
he flash suppressor o´ your Cobra's
MÀ34 minIgun Is Fr night fiRIng only,
but some unIts leave the suppressors
on all the timeÁday and nIght.
That means the tangs o´ the suppresÂ
sor get bumped and knocked aroundÃ
all day long. Ät's no wonder so many
suppressoÅs have to Æe replaced at $500
a whack.
Çemove the suppressor a´ter every night
fIring exercIse² Then look at it Fr cracks or ot±er
²
² ²
.
visible damage. ³f it's
ÆK,
store it untIl the next Èght fÉng exercÊse²
³´ you ´ind cracks or ¾ends, replace the suppressor wIth NSN À005·00·253·
5885.
If your unit has not received a message you have an ±nteRest ²n,
check with your next higheR headqua³ers.
UH-1-89-M´M-03
Verifying lhe FaiL·
ure code oN tai± rotor grips, and
usiNg the correct retiremeNt Life oN
tai± rotor grips² 032130Z May 89.
AHµ1µ89µMIMµ04
³imited firing of
rockets with MK66 motor² 0422´´Z
µay 89.
UH¶1·¸IMµ89µ04
AL±owab±e condi-
tioNs for ground¶ruNups, 052030Z
May 89¸
CH-47-89-MIM¹09
¹ueL ce±L inspecº
tion schedu±e» 0819´0Z May 89¼
UH-60µ89-MIM-04
Remainder
of
stabiLator iNspection requirements
and advance notiFicatioN oF manuaL
chaNges» 102115Z May 89½
ºH-1-MIM»89¼05
Sa±vo
FiriNg
o¾
rockels» 172130Z May 89¿
½Hµ60¾89-MIMµ05
AdvaNce notifi·
catioN of TM maNua± chaNge coNº
cerning the engine suppoÀt tube,
2322´0Z May 89¸
½Hµ1µ¿9µMIM¾05
A±± UHÁ1 aircraft
with rebuiLt TÁ53 engines, compoÂ
neNts requiriNg DA ¹orm 2410 re·
poÃing, 312130Z May 89Ä
ÇÈÉ 1 ÊËÌ pÍÎÏÐ:
ÈuÉÑVÑÒ ÓÔ3ÕÖ×ÓÓ
(ÖØ ÙÑuÌÚ)
ºH-64¾89-07
SO¹, ÅechNica±, Inº
spection oF reFue±ing Line coup±ing
assemb±ies, ´321 ÆÆZ May 89Ç
ºHÀ64Á89Á08
SO¹» MaiNl Mandaº
tory» Rep±acement ±ife change oF
canopy
removaL
system
(CRS)
componeNts
and
chaNge
to
emergency
egress
procedures,
091800Z May 89.
ºH-64µ89Â09
SO¹, MaiN! Mandaº
tory, Ènspection oF taiL rotor sWashÉ
p±ate bearing² 17171 ?Z May 89¸
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